Add declaration provider

.chronus/changes/decl-provider-2026-0-15-15-41-29.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/emitter-framework"
+---
+
+Add DeclarationProvider, a mechanism to reactively track declarations discovered as they are emitted.

.chronus/changes/decl-provider-2026-0-15-15-43-16.md

@@ -0,0 +1,7 @@
+---
+changeKind: breaking
+packages:
+  - "@typespec/emitter-framework"
+---
+
+TypeScript: Adopt DeclarationProvider, which changes how refkeys to declarations are assigned and referenced. The current provider vends fresh refkeys when needed, so `refkey(type)` is no longer a viable way to refer to declarations created by the emitter framework. Replace all forms of `refkey(type)` with `dp.getRefkey(type)`.

.chronus/changes/decl-provider-2026-0-15-15-43-33.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-js"
+---
+
+Adopt EF changes.

.chronus/changes/decl-provider-2026-0-15-15-44-18.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-js"
+---
+
+Don't emit types for built-ins like floats and such (which were unused anyway).

.chronus/changes/decl-provider-2026-0-15-15-45-2.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-js"
+---
+
+Emit types for model is `Record<T>`.

.chronus/changes/decl-provider-2026-0-15-15-49-58.md

@@ -0,0 +1,7 @@
+---
+changeKind: breaking
+packages:
+  - "@typespec/emitter-framework"
+---
+
+TypeScript: remove notion of suffix refkey. Since its purpose is to create a unique refkey based on the suffix, users can just provide such a refkey instead of providing the suffix.

.chronus/changes/decl-provider-2026-0-15-15-51-26.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/emitter-framework"
+---
+
+Add `refkey` option to `buildParameterDescriptor`.

packages/emitter-framework/package.json

@@ -23,18 +23,23 @@
   },
   "exports": {
     ".": {
+      "development": "./src/core/index.ts",
       "import": "./dist/src/core/index.js"
     },
     "./csharp": {
+      "development": "./src/csharp/index.ts",
       "import": "./dist/src/csharp/index.js"
     },
     "./typescript": {
+      "development": "./src/typescript/index.ts",
       "import": "./dist/src/typescript/index.js"
     },
     "./python": {
+      "development": "./src/python/index.ts",
       "import": "./dist/src/python/index.js"
     },
     "./testing": {
+      "development": "./src/testing/index.ts",
       "import": "./dist/src/testing/index.js"
     }
   },

packages/emitter-framework/src/core/context/declaration-provider.ts

@@ -0,0 +1,25 @@
+import { DeclarationProvider } from "#core/declaration-provider.js";
+import { type ComponentContext, createNamedContext, useContext } from "@alloy-js/core";
+import type { Typekit } from "@typespec/compiler/typekit";
+import { useTsp } from "./tsp-context.js";
+
+/**
+ * Provides the declaration provider that is used to get refkeys for
+ * declarations and determine if a type should be declared or referenced.
+ */
+export const DeclarationProviderContext: ComponentContext<DeclarationProvider> =
+  createNamedContext<DeclarationProvider>("DeclarationProviderContext");
+
+export function useDeclarationProvider(): DeclarationProvider {
+  return useContext(DeclarationProviderContext) ?? getDefaultDeclarationProvider(useTsp().$);
+}
+
+const knownDeclarationProviders = new WeakMap<Typekit, DeclarationProvider>();
+function getDefaultDeclarationProvider($: Typekit) {
+  let provider = knownDeclarationProviders.get($);
+  if (!provider) {
+    provider = new DeclarationProvider($);
+    knownDeclarationProviders.set($, provider);
+  }
+  return provider;
+}

packages/emitter-framework/src/core/context/index.ts

@@ -1,2 +1,3 @@
+export * from "./declaration-provider.js";
 export * from "./name-policy-context.js";
 export * from "./tsp-context.js";